(Also, you DID close the inlet side on the chamber... right?)
Wheres the cute little white air filter that goes on ur chambers manifold, opposite the vac line? You dont wanna suck in nasties....
Make sure that sides valve is closed (right angle with flow)
Close vac line side as well....
Connect and turn on vac pump. (Should be oil filled already at this point, if not, do so!)
Slowly open the valve on the vac line side... should see pressure almost instantly. Get to 10ish, close valve. Wait and watch a few seconds, to make sure your seal is solid. Made need to press down on the lid(happens), or adjust the orange band(rare). If seal is good.... let 'er rip.... (By that I mean slowly open vac line valve, and watch the bubbles, dont let anything touch the walls/top!)
When ur maxed out, close the valve, OFF the pump, and REMOVE the vac hose from the chamber.... (You only need one time of fucking up to learn this one, vac pump oil + BHO = tears)
You will need to top off the vac pressure as it extracts the butane into gas.... for best results, I find a seedling mat to provide the perfect temp for oil under full vac to turn into shatter.... just set ur chamber on it.
Remember even with the vac chamber, proper BHO is gonna take days to fully purge.... Takes over a week for me, cuz I winterize n purge again.....
Pretty high so I am rambling, but if ya have questions, I have home user level experience with simple closed column n shatter chambers....
Yes, using only puretane and a vac oven is preferred (safest!) but some of us are ballers on a budget, lol.
(invest in the puretane, I ran my first batch the other day with it finally.... noticeably better than any other brand...)